My thanks to NASA for adding color to a picture of Mount Etna Boiling Over. It allows one to distinguish different parts of the photograph.
See the above link for the complete story. If you want to analyze the image in the vOICe, then you will need to download the image. Given that the story tells you what the differently colored areas are, you can use the color filters to interpret the image.
The story says that snow is blue green. The vOICe can only apply one color filter at one time. However, Thanks to Dr. Meijer we learn that “Blue-green is cyan” so we can use alt+shift+c to see the snow.